Suggested Retail: $44.99. AERO-GRO Digital 4-in-1 Water Quality Testing Kit - High Accuracy Digital pH/TDS/EC/Temp Pen Set - This AERO-GRO Digital 4-in-1 Water Quality Testing Kit provides high accuracy pH, TDS, EC, and temperature readings. It can be used to test drinking water, pool or spa water, and even the water produced by your alkalizer. It's also useful for hydroponic and aeroponic growers, making it a versatile tool for anyone needing to monitor water quality. Brand: AERO-GRO Model: Aero-Gro -- LOT STICKER: TCE-BOX-BOXTCE00531-ITEM-f33f705c___LPNRRCR3580755 -- SIZES ARE ESTIMATED. 7 CALENDAR DAY FULL REFUND GUARANTEE (FROM PRIMARY PICKUP DATE) ON THIS ITEM IF ANY ISSUE IS FOUND THAT WAS NOT DESCRIBED/PICTURED. 7 CALENDAR DAY STORAGE (FROM PRIMARY PICKUP DATE) IS ALSO AVAILABLE. THE PRIMARY PICKUP DATE IS THE DAY AFTER THE AUCTION ENDS. SEE NOTES TO BIDDER, IN AUCTION DETAILS, AT THE TOP OF PAGE 1 FOR MORE INFO.